# What's the main difference between different motion capture systems (Vicon, Optitrack, etc)?

Last month I visited a quadrotor laboratory ($20m^2$ approx). They used both Optitrack and Vicon systems. However, they told me that Vicon cost 10 times as much as Optitrack. Considering that any system of motion capture relies on the same principles of IR markers, which might be the reason for this difference in price?